Looms for weaving



Oct. 16, 1956 Filed June 17, 1953 l. H. THOMAS ET-AL LOOMS FOR WEAVING 5 Sheets-Sheet. l

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Oct. 16, 1956 l. H. THOMAS ET Al. 2,766,776

LOOMS FOR WEAVING Filed June 17, 1953 5 Sheets-Sheet 2 )NVE NTORS'.

Oct. 16, 1956 Filed June 17, 1953 l. H. THOMAS ET AL LOOMS FOR WEAVING 5 She'ets-Sheet 3 membres:

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Loon/1s FOR WEAVING Filed June 17, 1953 5 Sheets-Sheet 5 n HMM? I'NlfENToR:

LOOMS FOR WEAVING Iorwerth Heiin Thomas and Frank Davies, Manchester,

England, assignors to The British Cotton Industry Research Association, Manchester, England, a British research association Application June 17, 195B, Serial No. 362,329

Claims priority, application Great Britain .lune 19, 1952 10 Claims. (Cl. 139-171) This invention relates to drop-box motions for looms for weaving of the kind in which the sword arms for the slay are carried by a bracket pivotally mounted on the bottom or picking shaft instead of on a separate swing rail. This inventionis particularly, though not exclusively, applicable to a twobytwo pick loom' of the above kind as described in the specification of our U. S. Patent No. 2,621,680.

The object of the invention is an improved motion for actuating the drop-box of a wea-ving loom, the term drop-box motion being used to define a construction having a multiple compartment shuttle box which is movable up and down to alternative positions as distinct from a circular box motion in which the multiple compartment shuttle box is rotatable to alternative positions relative to the picking mechanism.

According to the invention a drop-box mot-ion for a loom of the kind having a shuttle slay, abottom shaft, sword arms supporting the slay' from the said bottom shaft, means for rotating said bottom shaft, means for reciprocating the slay in timed relation to the rotation ofv the bottom shaft and a multiple compartment shuttle drop-box mounted on said slay comprises in combination, means coupled to said bottom shaft for converting continuous rotary motion of said bottom shaft into intermittent rotary motion, further means for converting said intermittent rotary motion into reciprocating motion and means for imparting said intermittent rotary` motion to said drop box.

The loom aforesaid may be further characterised by crank and connecting rod means for converting the intermittent rotary motion' of the mechanism into reciprocating motion.

The invention also comprises the method of actuating a drop box of a loom comprising the step of converting a continuous rotary motion into an intermittent rotary motion and the further step of converting the intermittent rotary motion into reciprocating linear motion and mparting the. latter to the drop box.

In the drawing:

Fig. l is a longitudinal part section and Fig. 2 is an end elevation of one example ofv an improved motion for actuating the drop-box of a two-by-two pick loom, the picking motion of which is described in the said earlier specification.

Figs. 3 and 4 are fragmentary views showing modifications of the construction shown in Figs. ll and 2.

Fig. 5 is a schematic side view of an arrangement according to the present invention; and

Fig. 6 is a schematic front View of the arrangement of Fig. 5.

The loom aforesaid, in common with all two-by-two pick looms, has a drop-box at one side only and a. single shuttle box at the other, and the mechanism shown illustrates a two-box motion. That is to say the drop-box has two compartments.

As shown in Figs. l and 2 of the drawing, 10 is one end rates atent ice of the bottom or picking shaft of a loom supported' on a bearing 11 and carrying a picking cam 12. Pivotally mounted on the shaft is' a box-like bracket 13 carrying a picking stick 14 and having a facing to which is secured the lower end of a sword arm 15 for the loom slay 16, all as described in the specication of our co-pending application for patent aforesaid. On the endv of the slay is mounted a Z-compartment drop-box 17.

The box-like bracket 13 is formed with an extension having a boss 18 forming a bearing` for a counter'shaft 19 parallel to the bottom shaft 10 and having an overhanging bearing boss 20 journalled on an extension ofl a Ibushing 11a in the bearing 11. Secured to the end of the shaft 10 by a key 21 is a boss 22 having a radially extending arm 23 shown in its downward position. Supported on the boss 22 is a driving member of an intermittent drive including a disc like portion 24 and a gear segment 25 shown in the lower portion of such member, the gear segment being set back out of the plane of the disc portion and in register with a notch 26 in such disc portion. In the arm 23 and driving member are a plurality of alternative holes for a bolt 27 by which the driving member may be secured to such arm 23 in alternative angular positions, the pitch of the complementary holes being different for that purpose so that thev radial position of the driving member on the picking shaft, may be adjusted. On the end of the countershaft 19 is a driven member comprising a disc portion 29 and a toothed portion 30. The teeth on the gear segment 25 of the driving member and on the toothed portion 30 of the' drivenA member are complementary and each embody extra large teeth 25a' n and 30a respectively having greater strength, the better towithstand the shock of engagement. On the other end of the countershaft 19 is fixed a disc 31 carrying a crankpink 32 for a connection rod 33 for converting the rotary' motion of the countershaft into reciprocating motion, the upper end of the connecting rod being secured to the' shuttle drop-box 17.

ln use, the bottom or picking shaft 10 is rotatedI at the usual half-speed relative to the reciprocations of the' slay so that the picking cams 12 at each end of the loom operate alternately. With each rotation of the shaft 10` the countershaft 19 is turned through 180 degrees so that the crankpin 32 for two picks is in the uppermost position as shown and then for the next two picks in a lowermost position. The countershaft 19 is locked against rotation by the disc 24 engaging diametrically' opposite notches 29a in the disc 29 except when the notch 26 and toothed segment come into register with the notch 29a and gear wheel 39. Consequently the shuttle' drop-box is locked in its alternative raised and lowered positions;

Figsh 5 and 6 show the arrangement of theK present.

inventiony in two schematic views from which it can be` seen that as the bobbin drive shaft 1i)- isl rotated, the cam. 12. reciprocates picking sticks 14, wh-ile the bracket 1:3, and thereby the slay swords and the slay I6, are pivoted. The mechanical movements 25, 3d and31, 33 are driven from the slayv supporting drive shaft 10 to reciprocate the drop box 17 which, is mounted on the slay 1'6;

The drop-box construction above described is located at one side only of the loom for a two-and-two pick motion but the inventionl is not limited' to this arrangement; For example, byv the simple modification of introducing a dog-clutch or sliding key between the shaft I9 and the crank 31, 32', by introducing selector mechanism:

Referring now to Figs. 3 and 4 which show a modified embodiment of the invention, elements appearing therein and corresponding to elements in Figs. 1 and 2 are indicated by the same reference numerals with a prime added thereto.

As shown in Figs. 3 and 4, the left-hand end of the box-like bracket 13 is extended at 13a' to have a bearing boss a beyond the boss 22' keyed to the shaft 10' in place of the boss 20 of Fig. l on the inside of such boss 22. The bracket 13 has an upper extension 13b' over the disc 29' and toothed portion 30 and adapted to receive a removable cover 13C.

The modification above described enables the box-like bracket to hold a lubricant for the mechanism located within it, including particularly the complementary overlapping perimeters of the gear segment and the toothed portion 30 of the member 29'. Compared with previously known constructions the mechanism has less inertia and provides greater positioning accuracy. The drop-box for instance has no movement in the direction of dropping or rising resulting from reciprocation of the slay. Again the mechanism for the actuation of the drop box and picker are enclosed to enable oil bath lubrication to be provided while also substantially enclosing such mechanism and thereby reducing noise emanating therefrom.

What we claim is:

1. In a loom, in combination, a continuously rotating bottom drive shaft; a reciprocating slay means pivotally supported on said bottom drive shaft; a multiple compartment shuttle drop box mounted on said slay means for reciprocating movement; a rotary means mounted on said slay means; iirst mechanical movement means connecting said bottom drive shaft with said rotary means for converting the continuous rotary motion of said bottom drive shaft into intermittent rotary motion of said rotary means; and second mechanical movement means connecting said rotary means with said drop box for converting intermittent rotary motion of said rotary means in a reciprocating motion of said drop box.

2. In a loom, in combination, a continuously rotating bottom drive shaft; a bracket member turnably supported on said bottom drive shaft for pivotal reciprocating movement about the axis of the same; a slay supported on said bracket member for pivotal movement with the same; a multiple compartment shuttle drop box mounted on said slay for reciprocating movement between a plurality of positions; a rotary means mounted on said bracket member; a first mechanical movement means mounted on said bracket member and connecting said bottom drive shaft with said rotary means for converting the continuous rotary movement of said bottom drive shaft into intermittent rotary motion of said rotary means; and second mechanical movement means mounted on said bracket member and connecting said rotary means with said drop b ox for converting the intermittent rotary motion of said rotary means into a reciprocating motion of said drop box.

3. An arrangement as claimed in claim 2 wherein said rotary means is a countershaft tnrnably mounted on said bracket member and extending parallel to said bottom drive shaft, and wherein said second mechanical movement means include a crank on said countershaft; and a connecting rod pivotally connected to said crank and to said drop box.

4. An arrangement as claimed in claim 2 wherein said rstmechanical movement means includes a toothed segment secured to said bottom drive shaft for rotation therewith; gear means connected to said rotary means for rotation therewith and being engaged at spaced time intervals by said toothed segment to mesh with the same whereby the continuous rotary motion of said bottom drive shaft is converted into an intermittent motion of said rotary means.

5. An arrangement as claimed in claim 4 wherein said first mechanical movement means includes locking means 4, for locking said rotary means when said toothed segment is during rotation of said bottom drive shaft in a position spaced and disengaged from said gear means and said rotary means is at a standstill.

6. An arrangement as claimed in claim 4 wherein said first mechanical movement means comprises locking means which include a iirst locking disc connected to said rotary means for rotation therewith and being formed with a peripheral recess; and a second locking disc connected to said bottom drive shaft for rotation therewith and having a peripheral circular rim formed with a recess, said peripheral circular rim of said second locking disc slidably engaging said peripheral recess of -said iirst locking disc during rotation of said second locking disc and locking said first locking disc while said toothed segment is in a position spaced from said gear means, said recess in said rim of said second locking disc being located opposite the periphery of said first locking disc and permitting rotation of the same and of said rotary means when said toothed segment is in meshing engagement with said gear means.

7. In a loom, in combination, a continuously rotating bottom drive shaft; a bracket member turnably supported on said bottom drive shaft for pivotal reciprocating movement about the axis of the same; a slay supported on said bracket member for pivotal movement with the same; a multiple compartment shuttle drop box mounted on said slay for reciprocating movement between a plurality of positions; a countershaft turnably mounted on said bracket member and extending parallel to said bottom drive shaft; a toothed segment secured to said bottom drive shaft for rotation' therewith; a gear means iixed on said countershaft for rotation therewith and being engaged by said toothed -segment during each revolution of said bottom drive shaft so that said countershaft is intermittently turned during each revolution of said bottom shaft; locking means actuated by said bottom drive shaft for locking said countershaft in positions of said bottom shaft in which said toothed segment is spaced from said gear means and disengaged from the same; and a crank drive connecting said countershaft with said drop box for reciprocating the same between said positions whenever said countershaft is turned by said toothed segment.

8. In a loom, in combination, a continuously rotating bottom drive shaft; a box-shaped bracket member turnably supported on said bottom drive shaft for pivotal reciprocating movement about the axis of the same; a slay supported on said bracket member for pivotal movement with the same; a multiple compartment shuttle drop box mounted on said slay for reciprocating movement between a plurality of positions; a countershaft turnably mounted on said bracket member and extending parallel to said bottom drive shaft; a toothed segment secured to said bottom drive shaft for rotation therewith; a' gear means xed on said countershaft for Vrotation therewith and being engaged by said toothed segment during each revolution of said bottom drive shaft so that said countershaftis intermittently turned during each revolution of said bottom shaft; locking means including a first locking disc connected to said countershaft for rotation therewith and being formed with a peripheral recess, a second locking disc connected to said bottom drive shaft for rotation therewith and having a peripheral rim formed with a recess, said peripheral rim of. said locking disc slidably engaging said peripheral recess of said first locking disc during the rotation of said second locking disc and locking said first locking disc while said toothed segment is in a position spaced from said gear means so that said countershaft does not turn, said recess in said rim of said second locking disc being Vlocated opposite the periphery of said `first locking disc and permitting rotation of the same and of said countershaft when said toothed segment is in meshing engagement with said gear; and a crank drive connecting said countershaft with said drop box for reciprocating the same between said positions whenever said countershaft is turned by said toothed segment.

9. In a loom, in combination, a continuously rotating bottom drive shaft; a box-shaped bracket member turnably supported on said bottom drive shaft for pivotal reciprocating movement about the axis of the same; a slay supported on said bracket member for pivotal movement with the same; a multiple compartment shuttle drop box mounted on said slay for reciprocating movement between a plurality of positions; a rotary means mounted on said bracket member; a first mechanical movement means mounted on said bracket member within the same and connecting said bottom drive shaft with said rotary means for converting the continuous rotary movement of said bottom drive shaft into intermittent rotary motion of said rotary means; and second mechanical movement means mounted on said bracket member and connecting said rotary means with said drop box for converting the intermittent rotary motion of said rotary means into a reciprocating motion of said drop box.

10. In a loom, in combination, a continuously rotating bottom drive shaft; a box-shaped bracket member turnably supported on said bottom drive shaft for pivotal reciprocating movement about the axis of the same; a slay supported on said bracket member for pivotal movement with the same; a multiple compartment shuttle drop box mounted on said slay for reciprocating movement between a plurality of positions; a countershaft turnably mounted on said bracket member and extending parallel to said bottom drive shaft; a toothed segment secured to said bottom drive shaft for rotation therewith and having an enlarged leading tooth portion; a gear means fixed on said countershaft for rotation therewith having an enlarged leading tooth portion and being engaged by said toothed segment during each revolution of said bottom drive shaft so that said countershaft is intermittently turned during each revolution of said bottom shaft; locking means including a rst locking disc connected to said countershaft for rotation therewith and being formed with a peripheral recess, a second locking disc connected to said bottom drive shaft for rotation therewith and having a peripheral rim formed with a recess, said peripheral rim of said locking disc slidably engaging said peripheral recess of said iirst locking disc during the rotation of said second locking disc and locking said first locking disc while said toothed segment is in a position spaced from said gear means so that said countershaft does not turn, said recess in said rim of said second locking disc being located opposite the periphery of said rst locking disc and permitting rotation of the same and of said countershaft when said toothed segment is in meshing engagement with said gear; and a crank drive connecting said countershaft with said drop box for reciprocating the same between said positions whenever said countershaft is turned by said toothed segment.

References Cited in the le of this patent UNITED STATES PATENTS 1,724,264 Egli Aug. 13, 1929 1,884,239 Reynolds Oct. 25, 1932 2,004,031 Bullard June 4, 1935 FOREIGN PATENTS 468,107 Great Britain June 29, 1937 507,052 Germany Sept. 11, 1930 700,722 Germany Dec. 28, 1940 

